EasternIowaNO3: Groundwater Quality

Description Usage Format Source References Examples

Description

Selected nitrite plus nitrate concentration data from wells in the National Water-Quality Assessment (NAWQA) Program in the eastern Iowa study unit survey.

Usage

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Format

Data frame with 30 rows and 12 columns

Name Type Description
su_code character Study unit code
site_no character USGS station number
C1sample_dt Date Cycle 1 sample date
C1sample_tm character Cycle 1 sample time
C1time_zone character Cycle 1 time zone datum
C1Nitrate.rmk character Cycle 1 remark code for nitrite plus nitrate concentration
C1Nitrate numeric Cycle 1 nitrite plus nitrate concentration
C2sample_dt Date Cycle 2 sample date
C2sample_tm character Cycle 2 sample time
C2time_zone character Cycle 2 time zone datum
C2Nitrate.rmk character Cycle 2 remark code for nitrite plus nitrate concentration
C2Nitrate numeric Cycle 2 nitrite plus nitrate concentration

Note: all concentrations are in milligrams per liter as nitrogen.

Source

Data retrieved from NWISWeb (http://nwis.waterdata.usgs.gov/ia/nwis/qw) on 2012-06-18. The data were rearranged and columns renamed to create matching data from each well. These data represent the nitrite plus nitrate concentration in a survey in eastern Iowa. The cycle 1 samples were collected during the summer of 1998, and the cycle 2 samples were collected during the summer of 2007.

The description of the study unit and the cycle 1 data are described in Sadorf and Linart (2000).

References

Sadorf, E.M, and Linart, S.M., 2000, Ground-water quality in alluvial aquifers in the eastern Iowa basins, Iowa and Minnesota: U.S. Geological Survey Water-Resources Investigations Report 00-4106, 46 p.

Examples

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data(EasternIowaNO3)
# Show the change from cycle 1 to 2, ignoring censoring
par(mar=c(5.1, 12.1, 1.1, 1.1))
plot(EasternIowaNO3$C1Nitrate, seq(nrow(EasternIowaNO3)), ylab="", xlab="Nitrate",
 yaxt='n', xlim=c(0, 25))
points(EasternIowaNO3$C2Nitrate, seq(nrow(EasternIowaNO3)), col='green')
axis(2, at=seq(nrow(EasternIowaNO3)), labels=EasternIowaNO3$site_no, las=1)

USGS-R/smwrData documentation built on May 9, 2019, 8:47 p.m.